Separate thankyou-page in Virtuemart

My website is running in Joomla and using Virtuemart as shopcomponent. I want to use a affiliateprogram. This program requires to embed a code on the thankyoupage after the payment is done. The standard thankyou-page in Virtuemart can not be used because on that page you will be redirected for paying with PayPal or iDeal. So what I want is a thankyou-page which I can use for each paymentway (cash on delivery, PayPal, iDeal, Payment in advance). In this way the ID for the affiliateprogram will only be shown when the payment is done. The project must be ready soon, because I want as soon as possible start with the affiliate program. If it is not clear, please let me know!